Kim Jong Un's sister Kim Yo Jong said it was a "very big mistake" for "lunatic" Suh Wook--South Korea's defence chief--to have discussed a pre-emptive strike against a nuclear power Seoul: North Korea will use its nuclear weapons to "eliminate" South Korea's army in the event they launch a pre-emptive strike, the powerful sister of leader Kim Jong Un said Tuesday. Kim Yo Jong's warning, carried in state media, was her second angry retort in three days to comments made by South Korea's defence chief Suh Wook last week...